no-fly zone is in effect, except for the world leaders who are landing at o'hare, as president barack obama and a number of world leaders... >> hockenberry: it was a big weekend in chicago. last spring, the president was in town, along with the leaders of nato, to discuss threats to global security and nuclear proliferation. at a huge convention center, the eyes of the world were wching. >> ...that demands global solutions. we came to chicago... (police whistle blows) >> hockenberry: but across town in a small hotel ballroom, the te of the world was also on the agenda. >> everything will be revealed in the second term. >> hockenberry: the eyes of the world might have missed this gathering. >> get ready for your al gore snow job. >> hockenberry: the message here is that man-made global climate change is a myth, a hoax. this conference is an annual pilgrimage for the key skeptics. we came here to understand how ey have ma their views a mainstream fact of american politics. (applause) they think of themselves as rebels, up against the biggest players in science, government and the media. >> wh